卷绕型超级电容器的电容特性

Capacitance behavior of spiral wound supercapacitor

以高性能活性炭为电极材料,采用锂离子电池和铝电解电容器的制作工艺,制备出尺寸为Φ12 mm×20 mm的卷绕型超级电容器。通过BET比表面积、扫描电镜、激光粒度和振实密度对活性炭进行了分析;通过恒流充放电、循环伏安和交流阻抗等方法,对超级电容器的充放电特性、功率特性、电容量、内阻、漏电流和循环寿命等进行了研究。活性炭的比表面积为1770 m2/g,总孔容为0.8316 ml/g,平均孔径为1.880 nm,平均粒径为5.19μm,振实密度为0.41 g/cm3。制备的超级电容器为2.5 V/6.0 F,直流内阻为150 mΩ,交流内阻为58 mΩ,功率特性和循环性能良好。

The spiral wound supercapacitor with the size of Ф12 mm × 20 mm based on the high performance activated carbon as electrode material was fabricated by the preparation process of Li-ion battery and electrolytic aluminium capacitor. The activated carbon was analyzed by BET specific surface area, scanning electron microscopy, laser particle size and tap density. The charge- discharge characteristics, power characteristics, capacitance, internal resistance, leakage current and cycle life of the supercapacitor were studied by galvanostatic charge-discharge, cyclic vohammetry and AC impedance methods. The specific surface area of the activated carbon was 1 770 m^2/g,the total pore volume was 0.831 6 ml/g,the average pore diameter was 1.880 nm,the average partical size was 5.19 μm and the tap density was 0.41 g/cm^3. The prepared supercapacitor was 2.5 V/6.0 F, the DC internal resistance was 150 mΩ, the AC internal resistance was 58 mΩ, the power characteristics and cycle performance were fine.